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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/analogin_api.c@469:fc4922e0c183, 2015-02-09 (annotated)

Committer:
mbed_official
Date:
Mon Feb 09 09:30:07 2015 +0000
Revision:
469:fc4922e0c183
Parent:
414:4ec4c5b614b0
Child:
489:119543c9f674
Synchronized with git revision 06e2b3c8802cb4f78e9958ba9923755bd458e8b7



Full URL: https://github.com/mbedmicro/mbed/commit/06e2b3c8802cb4f78e9958ba9923755bd458e8b7/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 52:a51c77007319 1 /* mbed Microcontroller Library
mbed_official 70:c1fbde68b492 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 70:c1fbde68b492 3 * All rights reserved.
mbed_official 52:a51c77007319 4 *
mbed_official 70:c1fbde68b492 5 * Redistribution and use in source and binary forms, with or without
mbed_official 70:c1fbde68b492 6 * modification, are permitted provided that the following conditions are met:
mbed_official 52:a51c77007319 7 *
mbed_official 70:c1fbde68b492 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 70:c1fbde68b492 9 * this list of conditions and the following disclaimer.
mbed_official 70:c1fbde68b492 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 70:c1fbde68b492 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 70:c1fbde68b492 12 * and/or other materials provided with the distribution.
mbed_official 70:c1fbde68b492 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 70:c1fbde68b492 14 * may be used to endorse or promote products derived from this software
mbed_official 70:c1fbde68b492 15 * without specific prior written permission.
mbed_official 52:a51c77007319 16 *
mbed_official 70:c1fbde68b492 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 70:c1fbde68b492 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 70:c1fbde68b492 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 70:c1fbde68b492 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 70:c1fbde68b492 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 70:c1fbde68b492 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 70:c1fbde68b492 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 70:c1fbde68b492 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 70:c1fbde68b492 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 70:c1fbde68b492 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 52:a51c77007319 27 */
mbed_official 227:7bd0639b8911 28 #include "mbed_assert.h"
mbed_official 52:a51c77007319 29 #include "analogin_api.h"
mbed_official 52:a51c77007319 30
mbed_official 52:a51c77007319 31 #if DEVICE_ANALOGIN
mbed_official 52:a51c77007319 32
mbed_official 52:a51c77007319 33 #include "cmsis.h"
mbed_official 52:a51c77007319 34 #include "pinmap.h"
mbed_official 174:8bb9f3a33240 35 #include "wait_api.h"
mbed_official 414:4ec4c5b614b0 36 #include "PeripheralPins.h"
mbed_official 52:a51c77007319 37
mbed_official 52:a51c77007319 38 int adc_inited = 0;
mbed_official 52:a51c77007319 39
mbed_official 402:09075a3b15e3 40 void analogin_init(analogin_t *obj, PinName pin)
mbed_official 402:09075a3b15e3 41 {
mbed_official 174:8bb9f3a33240 42 ADC_TypeDef *adc;
mbed_official 52:a51c77007319 43 ADC_InitTypeDef ADC_InitStructure;
mbed_official 174:8bb9f3a33240 44
mbed_official 167:d5744491c362 45 // Get the peripheral name from the pin and assign it to the object
mbed_official 52:a51c77007319 46 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 227:7bd0639b8911 47 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 52:a51c77007319 48
mbed_official 52:a51c77007319 49 // Configure GPIO
mbed_official 52:a51c77007319 50 pinmap_pinout(pin, PinMap_ADC);
mbed_official 52:a51c77007319 51
mbed_official 52:a51c77007319 52 // Save pin number for the read function
mbed_official 52:a51c77007319 53 obj->pin = pin;
mbed_official 52:a51c77007319 54
mbed_official 52:a51c77007319 55 // The ADC initialization is done once
mbed_official 52:a51c77007319 56 if (adc_inited == 0) {
mbed_official 52:a51c77007319 57 adc_inited = 1;
mbed_official 52:a51c77007319 58
mbed_official 52:a51c77007319 59 // Get ADC registers structure address
mbed_official 52:a51c77007319 60 adc = (ADC_TypeDef *)(obj->adc);
mbed_official 174:8bb9f3a33240 61
mbed_official 167:d5744491c362 62 // Enable ADC clock (14 MHz maximum)
mbed_official 167:d5744491c362 63 // PCLK2 = 64 MHz --> ADC clock = 64/6 = 10.666 MHz
mbed_official 167:d5744491c362 64 RCC_ADCCLKConfig(RCC_PCLK2_Div6);
mbed_official 52:a51c77007319 65 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
mbed_official 174:8bb9f3a33240 66
mbed_official 52:a51c77007319 67 // Configure ADC
mbed_official 167:d5744491c362 68 ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
mbed_official 167:d5744491c362 69 ADC_InitStructure.ADC_ScanConvMode = DISABLE;
mbed_official 52:a51c77007319 70 ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
mbed_official 167:d5744491c362 71 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
mbed_official 167:d5744491c362 72 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
mbed_official 167:d5744491c362 73 ADC_InitStructure.ADC_NbrOfChannel = 1;
mbed_official 52:a51c77007319 74 ADC_Init(adc, &ADC_InitStructure);
mbed_official 52:a51c77007319 75
mbed_official 52:a51c77007319 76 // Enable ADC
mbed_official 52:a51c77007319 77 ADC_Cmd(adc, ENABLE);
mbed_official 52:a51c77007319 78
mbed_official 52:a51c77007319 79 // Calibrate ADC
mbed_official 52:a51c77007319 80 ADC_ResetCalibration(adc);
mbed_official 174:8bb9f3a33240 81 while (ADC_GetResetCalibrationStatus(adc));
mbed_official 52:a51c77007319 82 ADC_StartCalibration(adc);
mbed_official 174:8bb9f3a33240 83 while (ADC_GetCalibrationStatus(adc));
mbed_official 52:a51c77007319 84 }
mbed_official 52:a51c77007319 85 }
mbed_official 52:a51c77007319 86
mbed_official 402:09075a3b15e3 87 static inline uint16_t adc_read(analogin_t *obj)
mbed_official 402:09075a3b15e3 88 {
mbed_official 174:8bb9f3a33240 89 // Get ADC registers structure address
mbed_official 174:8bb9f3a33240 90 ADC_TypeDef *adc = (ADC_TypeDef *)(obj->adc);
mbed_official 174:8bb9f3a33240 91 int channel = 0;
mbed_official 52:a51c77007319 92
mbed_official 174:8bb9f3a33240 93 // Configure ADC channel
mbed_official 174:8bb9f3a33240 94 switch (obj->pin) {
mbed_official 174:8bb9f3a33240 95 case PA_0:
mbed_official 174:8bb9f3a33240 96 channel = 0;
mbed_official 174:8bb9f3a33240 97 break;
mbed_official 174:8bb9f3a33240 98 case PA_1:
mbed_official 174:8bb9f3a33240 99 channel = 1;
mbed_official 174:8bb9f3a33240 100 break;
mbed_official 174:8bb9f3a33240 101 case PA_2:
mbed_official 174:8bb9f3a33240 102 channel = 2;
mbed_official 174:8bb9f3a33240 103 break;
mbed_official 174:8bb9f3a33240 104 case PA_3:
mbed_official 174:8bb9f3a33240 105 channel = 3;
mbed_official 174:8bb9f3a33240 106 break;
mbed_official 174:8bb9f3a33240 107 case PA_4:
mbed_official 174:8bb9f3a33240 108 channel = 4;
mbed_official 174:8bb9f3a33240 109 break;
mbed_official 174:8bb9f3a33240 110 case PA_5:
mbed_official 174:8bb9f3a33240 111 channel = 5;
mbed_official 174:8bb9f3a33240 112 break;
mbed_official 174:8bb9f3a33240 113 case PA_6:
mbed_official 174:8bb9f3a33240 114 channel = 6;
mbed_official 174:8bb9f3a33240 115 break;
mbed_official 174:8bb9f3a33240 116 case PA_7:
mbed_official 174:8bb9f3a33240 117 channel = 7;
mbed_official 174:8bb9f3a33240 118 break;
mbed_official 174:8bb9f3a33240 119 case PB_0:
mbed_official 174:8bb9f3a33240 120 channel = 8;
mbed_official 174:8bb9f3a33240 121 break;
mbed_official 174:8bb9f3a33240 122 case PB_1:
mbed_official 174:8bb9f3a33240 123 channel = 9;
mbed_official 174:8bb9f3a33240 124 break;
mbed_official 174:8bb9f3a33240 125 case PC_0:
mbed_official 174:8bb9f3a33240 126 channel = 10;
mbed_official 174:8bb9f3a33240 127 break;
mbed_official 174:8bb9f3a33240 128 case PC_1:
mbed_official 174:8bb9f3a33240 129 channel = 11;
mbed_official 174:8bb9f3a33240 130 break;
mbed_official 174:8bb9f3a33240 131 case PC_2:
mbed_official 174:8bb9f3a33240 132 channel = 12;
mbed_official 174:8bb9f3a33240 133 break;
mbed_official 174:8bb9f3a33240 134 case PC_3:
mbed_official 174:8bb9f3a33240 135 channel = 13;
mbed_official 174:8bb9f3a33240 136 break;
mbed_official 174:8bb9f3a33240 137 case PC_4:
mbed_official 174:8bb9f3a33240 138 channel = 14;
mbed_official 174:8bb9f3a33240 139 break;
mbed_official 174:8bb9f3a33240 140 case PC_5:
mbed_official 174:8bb9f3a33240 141 channel = 15;
mbed_official 174:8bb9f3a33240 142 break;
mbed_official 174:8bb9f3a33240 143 default:
mbed_official 174:8bb9f3a33240 144 return 0;
mbed_official 174:8bb9f3a33240 145 }
mbed_official 174:8bb9f3a33240 146
mbed_official 174:8bb9f3a33240 147 ADC_RegularChannelConfig(adc, channel, 1, ADC_SampleTime_7Cycles5);
mbed_official 174:8bb9f3a33240 148
mbed_official 174:8bb9f3a33240 149 ADC_SoftwareStartConvCmd(adc, ENABLE); // Start conversion
mbed_official 174:8bb9f3a33240 150
mbed_official 174:8bb9f3a33240 151 while (ADC_GetFlagStatus(adc, ADC_FLAG_EOC) == RESET); // Wait end of conversion
mbed_official 174:8bb9f3a33240 152
mbed_official 174:8bb9f3a33240 153 return (ADC_GetConversionValue(adc)); // Get conversion value
mbed_official 52:a51c77007319 154 }
mbed_official 52:a51c77007319 155
mbed_official 402:09075a3b15e3 156 uint16_t analogin_read_u16(analogin_t *obj)
mbed_official 402:09075a3b15e3 157 {
mbed_official 298:7557d401dbc3 158 uint16_t value = adc_read(obj);
mbed_official 298:7557d401dbc3 159 // 12-bit to 16-bit conversion
mbed_official 298:7557d401dbc3 160 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
mbed_official 298:7557d401dbc3 161 return value;
mbed_official 52:a51c77007319 162 }
mbed_official 52:a51c77007319 163
mbed_official 402:09075a3b15e3 164 float analogin_read(analogin_t *obj)
mbed_official 402:09075a3b15e3 165 {
mbed_official 174:8bb9f3a33240 166 uint16_t value = adc_read(obj);
mbed_official 174:8bb9f3a33240 167 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mbed_official 52:a51c77007319 168 }
mbed_official 52:a51c77007319 169
mbed_official 52:a51c77007319 170 #endif